Improvement in bridges



tutti A(tl'jiite To allzchomttmayconccrn:

` ing manner:

chord.

.moon snEBoLu or KAN-TZ, PENNSYLVANIA.

, l LettctsPtteizt No..105,497, (lated July 19,1870.

IMPROVEMENT IN BRIDGES.

` The` Sehdule :referredto n these Letters Patent and making part of the'same.

ne `itlmtwn attr-nicola sensori), of Italia, in

the county of Snyder` and State of Pennsylvania, have g invented ,certain new. and `nseful- Improvements in Brldges; and do hereby declare that thefollowing is a full, clear, and exact description thereof', reference @being-had tothe accompanying drawing and to the'` letters ot' .reference marked `thereon making a part of this spccicationl i s, i i

The nature of my invention consists in the couhcrcinafter fully set forth.` Inorder to enablev others skilled in the art to which struction and `arrangement `of a bridge, as will be t my invention applertainsrfto make ,and use Ethe same, I

will now proceed to describe its construction and operation, `referring to the annexed drawing, in which- Figurel isa sideviewfof a portion'ot' my bridge; Figure 2 is aigplan viewof a part of the` bottom'of the bridge;`

Figure 3 shows ia portion of the bottom chord;

, Figure 4 is a sideiviewiof one ofthe iron'beams in the bottom of the bridge;`

Figure 5 is a transverserertical section through theLtop chord; l

`Figure 6 is-a sideview of a casting'` placed on the` e underside of the top-chord;` and Figure 7 is a bottom view of the same.` A-reprcsents the abutment of the bridge, upon which are placed two pillars, B B, suitably bracedV and secured for supporting the endsofthe top and bottom i chords of thebridge.

I ',.Lihe bottom chord of lthe bridge is composed of rods, C G,'and castings, D D, arranged in. the' followlo the lowelrendot each pillar B are secured four l finds, G40, by means of nuts on their inner ends.

"'.lwo of these rods pass through the first casting, D,

and are secured by nuts. The other two not only pass through the first casting,bnt also through the second, where they are, in turn, secured by nuts;

. To the'first casting two other rods are secured,

which pass through the second and fasten tothe of .the bottom eliord,iit' Ia rod should be broken or otherwiseinjured, itcanrcadily be replaced without disturbing the rest of the chord, and the rods may be shortened or lcngthcd by means of the nuts, as may be desired.

The top chord of the bridge is com-posed of timber, s

E, lined or covered on` the outside4 with L-shaped iron barsor rails, Gr, secured by bolts, as shown in iig. 5, care being taken to form broken joints with said iron bars. j

At suitable intervals iron plates or castings, a, are let into the top of the timber E, and rest upon the projecting fiangesof the bars or rails Gr G.

Through these plates or castings inclined rods or braces, b l, pass downward to thecastings D, on the bottom chord, and secured at both ends by nuts, as

. shown.

Across the two bottom chords, on the top of every other casting, D, is laid a metal bar, H, secured, by bolts, to the same, and extending a suitable distance beyond thebottom chords, where its ends are turned up, as shown in iig. 4.-

6 and 7, the projecting lugs e'e, ou their upper sides,V

being inserted in .recesses t'ormcdin the timber E, to hold the casting in position until the braces are pnt in` place.

From `each side of the casting D, which supports the metal bar H, a brace, L, extends to the nearest end ofthe cast-ing K.

Immediately beyond and from each side of the other castings I), which support the wood beams I, a brace, llLextends to the furthest end of the casting K on each `side.

'lhe braces L and M are so arranged that they are 4doubletoward-the center of the span, thereby impart-A ing greater strength to the' bridge. Y

Other braces, N, also pass from a suitable point ou the topchord to the abutment A, as shown in iig. 1. s For further security of the bridge, a wire rope, l), passes on each side of the top chord, its upper end being secured in suitable manner at the upper end of the pillar B, and its lower end passingunder a casting, R, and secured to a similar casting, asshown in tig. 1, said castings being placed near the center of the span under the bottom chord, and held in place by the tension of the ropes P P. Both ends ofthe rope 1? are tightened by nuts, as required.

A bridge thus constructed can be repaired, when The ends are then bracedl by rods, al d, tothe top necessary, in' any of its parts without building any additional frame-work for supporting the balance of the bridge.

The bottom chord, O D, may be used both on metal and wooden bridges.

Having thus fully described my invention,

What I claim as new, and desire to secure by Letters Patent, is-

v1. The combination of the rods O C and castings D D, forming the bottom chord of a bridge, when arranged substantially as herein set forth.

2. In combination with the bottom chords C D, the metal beams H H, wooden beams I I, and cross-braces J J, constructed and arranged substantially as shown and described,

3. lhe arrangement ofthe castings K K and braces L L and M M, for bracing and connecting the top and lcttom chords of a bridge, substantially as herein set orth.

4. The inclined rods or braces b b, connecting the castings a a, on thc top chord .E G, with the castings D D ofethe bottom chord, iu combination .with braces LAM and casting K, substantially as shown and described.

v5. The combination of the top chord E G, bottom chord, C D, beams H and I, cross-braces J, castings K, braces L and M, rods b b and d, castings a a., and with or without the wire ropes I P, and castings 1t, vall constructed and arranged substantially as and for vthe purposes herein set forth. o

In testimony that I claim the foregoing, I have hcrc unto set my hand this 30th day of May, 1870.

JACOB SEEBOLD.

Witnesses EnWARn FORRY, CHARLES BRoUsn. 

